Fig. 1

Displacements of a point-of-interest (POI) in the head of the pancreas of three healthy volunteers in anterior–posterior (a, e, i), left–right (b, f, j), and superior-inferior (c, g, k) principal directions and their average 3D trajectory (d, h, l). DENSE-MRIs were acquired during separate breathholds in the three anatomical planes (axial, sagittal, and coronal) coinciding at the POI, resulting in two independent measurements of displacement in each principal direction. The average 3D trajectory is overlayed on a standard-resolution voxel (red cube) and an ultra-high-resolution one (green cube)